The SIM maintains information in a series of “files” that are organized hierarchically, much like the operating system of a personal computer. These files may be for administrative purposes or be specific to the GSM user application. Data in these files are accessed through APDU commands sent to the operating system. A file is composed [...]
Archive for the ‘smartcards’ Category
This transmission protocol uses Application Protocol Data Units (APDU), which can be either commands or responses. These are sent across the electrical interface between the SIM and the mobile equipment, or the SIM-ME interface for short. CLA INS P1 P2 P3 Data Command APDU format. There are five fields in an APDU command. The class [...]
